Voter fraud is rare? How do they know that?

One of the constant refrains from those who oppose voter id is that voter fraud is very rare. The trouble with that argument is: how do they know that? It is circular logic: Since without checking voter id it is ridiculously easy to vote in someone else's name, it is impossible to know how often it happens.

How did secret info get into Hillary's email?

It has been widely reported that Hillary Clinton's email server was found to have information that was considered top secret. What hasn't been reported is, nor have I seen that anyone has asked, exactly how it got there. Whoever sent it through the server had either to originate the information, which seems extremely unlikely, or to copy or transcribe the info from an existing classified document. Lifting information from a highly classified document and putting it in an unsecure email or other unsecure form is about as gross a violation of security rules as one can get. How this happened and who was responsible must be high on the list of questions the FBI is hot after.
It also seems that they probably know the answers. It should not be too hard to track down the originator of the email, or chain of emails, and the identity of the classified document from which the information was lifted.
When the answers to these questions finally come out, we may well understand all too clearly why Hillary and her staff declined to be interviewed by the IG.